26772

Appears in sequences

• a(n) = floor(n*(n+2)*(2*n-1)/8).at n=46A007518
• Numbers k such that sigma(k) and phi(k) are both palindromes.at n=10A113929
• Number of n X 3 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.at n=6A208309
• Number of nX7 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.at n=2A208313
• T(n,k)=Number of nXk 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.at n=38A208314
• T(n,k)=Number of nXk 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.at n=42A208314
• G.f. A(x,y) satisfies: A(x,y) = x*y + A(x,x*y)^2, with A(0,y) = 1.at n=95A275670
• a(n) = n*(n + 1)*(4*n + 5)/2.at n=23A281381